Electric heating element.



A. A. WARNER.

ELECTRIC HEATING ELEMENT. APPLICATION FILED MAY 6, 913.

1,081,414. Patented Dec. 16, 1913.

WITNE SSES BY min ATTORNEY tion, and Fig. 2 is an end view thereof.

' being closely coiled sothat its convolutions they may be in contact about the i heater is provided for. wh

minor coil being spaced on the on.

ALONZO A. WARNER, ornnwsnrrari .assrenon T0 LANnn-ns, Fanny & CLARK, or NEW BRITAZEBL. eo-anvne'rreu'r, conronarzolv or CONNECTICUT.

Enemies r.

Specification of Letters Patent.

Patented Dec. 16, 1913. Serial are. 765,816.

To all whom it may concern Be it known that I, Anonzo A. l hnmnn, citizen of the United States, and a resident of New Britain, in the county of Ij-lartford and State of Connecticut, have invented certain new and usefullmprovements in Eleotric Heating Elements, of which the following is a specification r The structure of this invention is intended for use in electrically heated utensils oi?- various sorts, such as are found in general use today. e

The object of the invention has been to provide a heater which would. produce a maximum of heating effect in a minimum of space, which means that there must be a maximum amount of resistance material in a minimum space. my purpose to make this heater pliable in order that it may be installed in a variety of ways and to suit any peculiar requirements of a given case.

Other features and advantages of the invention will become apparent from a consideration of the following description and claims.

I have illustrated one embodiment of my invention in the (lI'ELWlH S, where- Figure 1 is a side View of a section of a heater made in accordance with my inven- By reference to the drawingsit will be seen that my new heater consists of a compound coil or wire of the kind which when heated becomesicoated with an insulating oxid, the primary or minor coil preferably are in contact; this primary coil is then Wound preferably under slight tension about a small temporary arbor into a v ry compact secondary or coil, the ad acent convolutions of this coil 1g out oi contact, and the convolutions of the circum- :ference of the major convolutions, w. :le

cumference of the major convolr clearly seen in Fig. 2. This heater unsupported except through the st rigidity of the material from made; free circulation ofi air In addition it has been nth desire'to here point'out that my invention is distinguished from such a'construction in that it is a self-supporting structure, the entire surface of which is subject to effective radiation of the heat evolved, and is about a core of insulating 'materialfand I pliable in order that it maybe shaped to fit the recess within which it is to be installed. It is obvious that the size of the wire used is to be varied to suit the different.

conditions, and that the shape of the'convolutions of. the minor, coil can be varied. For instance, after the minorcoil has been formed it may-be flattened so as to reduce the total length of the completed element but slightly increasing its diameter. The

broader aspect of the invention, namely, a' self-supporting pliable'heater providing a maximum of heating effect within a m1nimum .space, may be present in a. structure wherein the prlmarymembei' is not-in the form of a coil but takes another shape, such as a crimped wire which may thenbe wound to form a major coil.

I claim as my invention 1. An electrical heating element in the form of a self-supporting, pliable coil formed from a suitable resistance wire, the h oi the wire in each convolution being itiian the circumference of the conution.

L. An electrical heating element in the of a self-supporting pliable compound coil, the convolutions of the major coil being out of contact 3. An electrical heating element in the orm or a self-supporting pliable compound oil; the adjacent convolutiqns of the minor coil having points of contact with one another, and those of the major coilbeing out of contact.

""he herein described method of formsists, first in forming astrand of resistance coil in order to open up the outer parts of material into :1 closed coil with 1ts convolults convolutlons.

tions in Contact, and second in windin this coil about a temporary mandrel into 3 sec- ALONZO 5 0nd coil whose convolutions are out of con- Witnesses:

tact, the first coil being subjected to a. slight JOSEPH F. LAMB,

totision while. being wound into the second HENRY C. DEMING. 

